On 2018-08-18 00:14:50 +0100, Jonathan Wakely wrote: > On Fri, 17 Aug 2018 at 23:27, Vincent Lefevre wrote: > > > > What's the point of the pointer-to-int-cast warning, which is > > enabled by -Wall? > > > > I get this warning under 32-bit Linux when casting a pointer to > > uintmax_t. I use uintmax_t to make sure that the integer size is > > large enough. So, what's the problem? > > sizeof(uintmax_t) != sizeof(void*). But why would this make the conversion invalid? > Why not use uintptr_t instead? Because this is not portable: "These types are optional." Another reason is that the code needs to support C90 compilers (and if uintmax_t is not available, there is a fallback to unsigned long long, else unsigned long). -- Vincent Lefèvre <vincent@xxxxxxxxxx> - Web: <https://www.vinc17.net/> 100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/> Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
